LOM-510A Low Resistance Micro Ohmmeter has 4½ digits, 002% basic accuracy and 1 μΩ resolution. Its 4-terminal measurement technique eliminates lead resistance errors and 80 dB of ac noise rejection provides rock-steady readings even in noisy locations The unit comes with rugged 4-terminal test clips and a large selection of optional probes, clips and fixtures allowing attachment to any low-resistance unknown.

• 1 μΩ resolution

• 0.02% basic accuracy

• Digital output

• Pulsed mode for auto-zero or
  constant dc

• Probes for chips and traces

Zero Adjust: Active only in DC (Continuous dc) mode.
Noise Rejection: 80 dB for SW (Switched dc) and Pulsed Mode; 60 dB for DC (Continuous dc) mode.
SW (Switched dc) Mode: Current switched on for 166 ms, then off for 500 ms (duty cycle = 0.25).
Pulsed Mode: One cycle of SW (Switched dc) mode; enabled by
shorting two contacts on rear panel connector.
Display: 4½ digit, 0.5 inch, red LED display.
Display Overrange Indication: Flashes for DC (Continuous dc) and SW (Switched dc); blanks in Pulsed mode.
Measurement Rate: 1.5 readings/second.
Connections to Unknown: 4-terminal Kelvin leads with shield.
Outputs: 5 BCD digits for value and polarity; Pulsed Mode Control lines; power supply lines; 25 pin "D" connector.
Warm up time: 1 minute to rated accuracy.
Accuracy vs. Temperature: Stated accuracy applies over an ambient temperature range of 18 to 27 °C. Error doubles over the range of 10 to 40 °C.
Accessories Supplied: LOM-501 test clips.
Power Requirements: 105-125 V or 210-250 V, 50-60 Hz, 30 W max.
Dimensions: 22.9 cm W x 5.1 cm H x 27.9 cm D (9" x 2" x 11")
Weight: 2.7 kg (6 lb).

Constant DC Mode:
Suitable for measuring the resistance of inductive components such as coils or transformers.
Pulsed Mode:
Provides low drive current to allow measurements of fuses, thermistors, and other thermally
sensitive devices.
Dry Circuit:
Assures that oxides and film contacts are not punctured.
The Dry Circuit Mode limits the open circuit voltage to 50 mV.
The Model LOM-510A/20 limits the open circuit voltage to 20 mV.

Parallel BCD outputs are included in the LOM-510A. This feature can be used with the optional
Model LOM-512 digital interface and limits comparator.
The LOM-510A/512 combination allows sorting of any low resistance components by absolute
limits or percent deviation. It has both LED's and an adjustable audio tone to indicate if a measurement is within the ranges set, and it supplies the micro-ohmmeter with handy push-buttons
for the pulse measurement mode of operation.
The LOM-512 Limits Comparator can be mechanically attached to the micro-ohmmeter with
the optional coupler kit.